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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
36/s = 4 // - 4
36/s-4 = 0
36*s^-1 = 4 // : 36
s^-1 = 1/9
-1 < 0
1/(s^1) = 1/9 // * s^1
1 = 1/9*s^1 // : 1/9
9 = s^1
s = 9
s = 9
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